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Commit 5b8b10e0 authored by Josh Gao's avatar Josh Gao
Browse files

adb: libusb: switch from polling for accessibility to a sleep. 

For unclear reasons, it seems that for some people, devices are
becoming accessible, inaccessible, and then inaccessible again.
Switch to a sleep for now.

Bug: http://b/62200735
Test: manual
Change-Id: Id51dcb188c3534a57c35cbfd30a181c99115a23c
parent 7dd382de

adb/client/usb_libusb.cpp

+4 −14
Original line number Diff line number Diff line
@@ -180,10 +180,6 @@ static std::string get_device_dev_path(libusb_device* device) { 
    if (port_count < 0) return "";

    return StringPrintf("/dev/bus/usb/%03u/%03u", libusb_get_bus_number(device), ports[0]);

}



static bool is_device_accessible(libusb_device* device) {

    return access(get_device_dev_path(device).c_str(), R_OK | W_OK) == 0;

}

#endif



static bool endpoint_is_output(uint8_t endpoint) {
@@ -389,18 +385,12 @@ static std::atomic<int> connecting_devices(0); 
static void device_connected(libusb_device* device) {

#if defined(__linux__)

    // Android's host linux libusb uses netlink instead of udev for device hotplug notification,

    // which means we can get hotplug notifications before udev has updated ownership/perms on

    // the device. Since we're not going to be able to link against the system's libudev any

    // time soon, hack around this by checking for accessibility in a loop.

    // which means we can get hotplug notifications before udev has updated ownership/perms on the

    // device. Since we're not going to be able to link against the system's libudev any time soon,

    // hack around this by inserting a sleep.

    auto thread = std::thread([device]() {

        std::string device_path = get_device_dev_path(device);

        auto start = std::chrono::steady_clock::now();

        while (std::chrono::steady_clock::now() - start < 500ms) {

            if (is_device_accessible(device)) {

                break;

            }

            std::this_thread::sleep_for(10ms);

        }

        std::this_thread::sleep_for(1s);



        process_device(device);

        if (--connecting_devices == 0) {